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Operating System Interface
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<H1 CLASS="chapter"><A NAME="htoc272">Chapter&nbsp;20</A>&nbsp;&nbsp;Operating System Interface</H1>

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<LI><A HREF="umsroot125.html">Introduction</A>
<LI><A HREF="umsroot126.html">Environment Access</A>
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<LI><A HREF="umsroot126.html#toc150">Command Line Arguments</A>
<LI><A HREF="umsroot126.html#toc151">Environment Variables</A>
<LI><A HREF="umsroot126.html#toc152">Exiting ECL<SUP><I>i</I></SUP>PS<SUP><I>e</I></SUP></A>
<LI><A HREF="umsroot126.html#toc153">Time and Date</A>
<LI><A HREF="umsroot126.html#toc154">Host Computer</A>
<LI><A HREF="umsroot126.html#toc155">Calling C Functions</A>
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<LI><A HREF="umsroot127.html">File System</A>
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<LI><A HREF="umsroot127.html#toc156">Current Directory</A>
<LI><A HREF="umsroot127.html#toc157">Looking at Directories</A>
<LI><A HREF="umsroot127.html#toc158">Checking Files</A>
<LI><A HREF="umsroot127.html#toc159">Renaming and Removing Files</A>
<LI><A HREF="umsroot127.html#toc160">Filenames</A>
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<LI><A HREF="umsroot128.html">Creating Communicating Processes</A>
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<LI><A HREF="umsroot128.html#toc161">Process creation</A>
<LI><A HREF="umsroot128.html#toc162">Process control</A>
<LI><A HREF="umsroot128.html#toc163">Interprocess Signals</A>
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